the new Matter protocol is the industry’s intended solution for this. All the big home automation players, including Google, Alexa, Apple, Samsung, IKEA, Philips, Aqara, Tuya, and many more are on board. The idea is that you’ll be able to buy any device with a matter logo (which initially will be mostly Wi-Fi, thread, or zigbee to Wi-Fi Bridges), and it will work with any of the major voice assistants and most of the major apps.
The SmartThings v3 hub was one of the first matter certified devices about a month ago, and there are more coming out.
It’s quite likely by this time next year integration will be pretty simple if you stick to devices with the matter logo, and there will be a lot of those.
Consumer reports has a good FAQ
And here’s the SmartThings-specific Discussion thread:
Matter - smart home connectivity standard (formerly Project CHIP)